For some patients, nutritional supplements can play a role in boosting the immune system and priming the body to better react to certain pathogens. Olive leaf extract has antiviral properties due to its stimulation of the propagation of natural killer cells in the body. Zinc lozenges can help restore and replenish the natural mucous membranes that trap viral particles in the airway before they can easily enter the bloodstream and infect a patient.
Additionally, oregano oil has been shown to have antimicrobial, antiviral, and antibacterial properties. It may be useful as a preventive measure in small quantities, or as a supplemental remedy once infection has already occurred.